Welcome to FDMB! Junior sure is a handsome boy!
Wow, you have a lot of information in your spreadsheet, that's wonderful! I see that you decided on using the AT meter rather than the Relion; it is more in tune with what most vets use, yes, but there is no need to deduct the 20 pts from your readings, that will only confuse things; human meters and pet meters cannot be compared because they test differently, so there is no formula for conversion.
What does the BAR and NQR in the comments on your ss mean?